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| pertaining to a mass of radioactive material in which the rate of a chain reaction increases with time |
| a wave in which the direction of displacement is perpendicular to the direction of propagation, as a surface wave of water |
| D particle
Either of two subatomic particles in the meson family, one neutral and one positively charged, having masses 3,649 and 3,658 times that of the electron and average lifetimes of 4.2 × 10-13 and 1.1 × 10-12 seconds, respectively. See Table at subatomic particle. |